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Living with Unilateral polymicrogyria

A brain condition present at birth in which one side of the brain has too many small folds, often causing seizures.

Understanding Unilateral polymicrogyria

Unilateral polymicrogyria is a brain malformation in which part or all of one side of the brain's outer layer has too many folds and abnormal layering.

It has two subtypes, depending on the area affected: unilateral hemispheric and focal. It is noticed in the newborn period or infancy.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Seizures
  • Weakness on one side of the body (hemiparesis)
  • Intellectual disability
  • Poor fine motor coordination
  • Muscle stiffness in the arms and legs (spastic tetraplegia)
  • Trouble with chewing and swallowing (pseudobulbar paralysis)

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists, genetic specialists and seizure and epilepsy specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    PMG Awareness Organization and Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Seizure and epilepsy specialists (epileptologist)
Expert care
Expert lists: PMG Awareness Organization, Epilepsy Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with PMG Awareness Organization and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Which brain imaging shows the area affected?
Which seizure treatments are suitable?
Which specialists, such as a neurologist, should be on our team?

Quick facts

Symptoms usually startNewborn and as an Infant

GARD says changes in genes (variants) cause this condition, but it doesn't name a specific gene.

GeneticNeurological

Patient organizations

Source: NIH GARD · Unilateral polymicrogyriaGARD ID 20980 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Unilateral polymicrogyria.

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Explore research for Unilateral polymicrogyria

Explore actively recruiting Unilateral polymicrogyria studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Unilateral polymicrogyria with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
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  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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